@Nick Sukhov
I noticed that you are looking at the DXTN69060CE-7 and DSS5540X-13.
They seem to be promising candidates for a low noise MC preamp with their relative high Hfe.
But take the low Rb specifications in their Spice models with great care, because as an example the ZTX951 is specified with Rb=29mOhm, while in several circuits it has been measured to be in fact 1.2Ohm, as also confirmed by H&H.
The ZTX950's Rb specified as being Rb=25mOhm has a much higher Rb at 1.0Ohm.
Also the Re and Rc figures seem almost to nice to be true, but their role in a low noise amp is less important as the Rb.
Hans
I noticed that you are looking at the DXTN69060CE-7 and DSS5540X-13.
They seem to be promising candidates for a low noise MC preamp with their relative high Hfe.
But take the low Rb specifications in their Spice models with great care, because as an example the ZTX951 is specified with Rb=29mOhm, while in several circuits it has been measured to be in fact 1.2Ohm, as also confirmed by H&H.
The ZTX950's Rb specified as being Rb=25mOhm has a much higher Rb at 1.0Ohm.
Also the Re and Rc figures seem almost to nice to be true, but their role in a low noise amp is less important as the Rb.
Hans
Another turntable to dream about by those with affluence less fortunate as me... and the homeless too... is the TechDAS
https://www.stereophile.com/content/techdas-air-force-zero-turntable Air-Force Zero.
The Rega turntable seems a well thought out decent enough turntable... perhaps even good value for money compared to the TechDAS-Air-force-zero and others. Yet the lightness of the Rega in the loop around from the stylus tip to the vinyl seems critically reliant upon the quality and manner of termination of its three feet into whatever these contact. In the whole, the platter and arm looks decently formidable, even in the manner of its inter-connection, yet the advantages of the Rega can be critically undermined by a faulty suspension beneath its feet.
Linn Sondek's and many other vintage turntables have spring suspensions with light damping as a layer of isolation. Even though these tables have alternative issues that could be more prominent than the Rega... the springs, dampers and particularly their location can be of considerable advantage in the manner of isolation. Of particular note is that the Linn is well done in my view, being accidentally good or by deliberate design. Less good is the Thoren TD125 and an early ("ugly") version of a Goldmund Studio that I have is remarkably poor. Incompetence seems to have abounded in the manner the Goldmund was suspended.
Yet in the world of turntables to begin to modify or gut, is the Audio Technica at-LP-7
https://www.audio-technica.com/en-c...N9X3l8eQqKqHKq_5uoZFZH0FBlbU7_xeCCEPBwiD31lQu
What is necessary in a turntable that doesn't begin with a drive motor and a reasonable heavy inert platter. Keep the arm, cartridge, plinth, and feet until all this can be thrown out, along with the phono stage. The platter/bearings/motor and drive is worth the cost of entry alone in my view at $850 US... being the core essence of the NAIA at $13,000. Seems diyer's can build upon the $850 US... seeming a great start as opposed to all the effort and cost involved in lieu of that start...
By the way... the spec.'s for the Rega NAIA appears riddled with hyperbole rather than to confess a single number...like wow and flutter.
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Nick, you mentioned the existence of modern MM carts having a tip mass of ca. 0.25mg
When trying to locate such cartridge I can only find MM carts with this low tip mass from Shure, Technics and Pickering, but none of them in production anymore.
Could you name a few that are still in production ?
Hans
When trying to locate such cartridge I can only find MM carts with this low tip mass from Shure, Technics and Pickering, but none of them in production anymore.
Could you name a few that are still in production ?
Hans
Hans, I am not sure in production right now, but (from audiosciencereview in Aug 2024)
0.25mg Yamaha MC-1X/MC1-1S (MC)
0.25mg *B&O MMC1 (MMC, sapphire tube, nude line contact)
0.25mg *Denon DL-207 (MC, amorphous boron pipe)
0.24mg *Van den Hul Colibri (MC)
0.23mg Pickering XSV 3000 (improved)
0.23mg *Technics EPC-P310MC (p-mount, MC, boron pipe)
0.23mg *Technics EPC-100CMK2 (MM, boron pipe)
0.22mg B&O MMC 6000 (MMC, beryllium, 7 µm/2 x 50 µm Pramanik)
0.220mg Ortofon Jubilee (MC)
0.2mg Elite Electronic Industries/EEI 747 Prelude, 700 Pacer (MM)
0.2mg Stanton 880S/881S/980LZS/981LZS (MI)
0.2mg Pickering XLZ 7500S (MM)
0.200mg *Empire 2000-Z (shielded moving iron, stylus 0.2 mil x 0.7 mil diamond)
0.190mg *Shure Ultra 400 (MM)
0.18mg Empire Golden Touch 1000 GT
0.18mg *Denon DL-303 (MC, alu, special elliptical)
0.170mg Shure Micro-Ridge (V15VMR, V15VxMR) (0.15x3.00mil, MM, beryllium cant)
0.168mg *Denon DL-305 (MC, amorphous boron pipe)
0.167mg *Yamaha MC-5 (MC)
0.165mg *Shure Ultra 500 (MM)
0.149mg *Technics EPC-(P)205CMK3 (MM, boron pipe)
0.145mg *Yamaha MC-3 (MC)
0.139mg *Technics EPC-P310MC2 (MC, boron pipe)
0.109mg *Technics EPC-(P)205CMK4 (0.2x0.7mil, MM, boron pipe)
0.105mg Yamaha MC-1000 (MC)
0.098mg *Technics EPC-(P)305MCMK2 (MC, boron pipe, 0.2x07mil)
0.098mg *Technics EPC-100CMK3 (MM, boron pipe)
0.077mg *Denon DL1000A (MC, amorphous boron pipe)
0.059mg Yamaha MC-2000 (MC, beryllium pipe, special elliptical)
0.055mg *Technics EPC-(P)100CMK4 (MM, boron pipe, 0.2x0.7mil)
Hi Nick,
Thx for the list.
I inspected this list earlier and when taking out the MC Carts, you are left with MM Carts that are no longer in production, quite sad, especially the Technics but also those low tip mass Shure Carts performed outstanding.
The current Cart manufacturers all seem to concentrate on MC Carts.
Hans
Thx for the list.
I inspected this list earlier and when taking out the MC Carts, you are left with MM Carts that are no longer in production, quite sad, especially the Technics but also those low tip mass Shure Carts performed outstanding.
The current Cart manufacturers all seem to concentrate on MC Carts.
Hans
I know why = they can sell MC for much more
Could you please stick to the Forum rules and write in English..
It may be very interesting what you want to tell, but unfortunately I can't read it.
Hans
I write in English as established by the forum rules!!!
true - using Google translator
the rest is as is
Not everything on this planet exists in English - many of the world's treasures are just beyond the English language
Sorry, my native language isn't English either, but I don't publish in Dutch.
Much of what you want to tell will get lost for many of us who don't want to Google.
Hans
Much of what you want to tell will get lost for many of us who don't want to Google.
Hans
Nick's circuit is one of an infinite number of incarnations - so there's no need to argue.
However, the fact that an original publication, in whatever form, is not automatically available in my native language is not a problem for me personally. We can ask - ask for explanations.
I don't follow Mr. Polak's comments, they were all completely unnecessary (and perhaps a little malicious).
kindly,
HBt.
Psst
we must not forget that translations or forum contributions are labor-intensive and good contributions take up an incredible amount of personal time.
However, the fact that an original publication, in whatever form, is not automatically available in my native language is not a problem for me personally. We can ask - ask for explanations.
I don't follow Mr. Polak's comments, they were all completely unnecessary (and perhaps a little malicious).
kindly,
HBt.
Psst
we must not forget that translations or forum contributions are labor-intensive and good contributions take up an incredible amount of personal time.
"сказано в точку" means "to the point"
This shouldn't really be here, but in the brevity the network on the right looks nicely simplistic in the comparison (though the -ve PSRR looks could be more problematic). It is nicely integrated though there isn't enough there of a novelty to want to convert the text. What isn't clear is what you are really trying to convey by displaying these two images.
I want to write to you personally (without public view) - there is an idea and several variants of realization
criticism of an experienced specialist is a very valuable opportunity
@Hierfi and @Svytoslav
It is best for one of you to open a new path /thread for discussion and debate. A direct circuit comparison of the cores is interesting.
The RIAA network must be included in the final discussion later.
I am already looking forward to an open and friendly exchange.
HBt.
It is best for one of you to open a new path /thread for discussion and debate. A direct circuit comparison of the cores is interesting.
The RIAA network must be included in the final discussion later.
I am already looking forward to an open and friendly exchange.
HBt.
30+ posts have been deleted. Stick to the topic, post in English and stop trying to outsmart each other.
If this thread derails again like this it will be closed.
How is your scheme fundamentally different from this ancient Kenwood ka-9100-9150 ?
How is your scheme fundamentally different from this ancient Kenwood ka-9100-9150 ?
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